34. Count Set Bits in an 8-bit Register

#include <stdio.h>
#include <stdint.h>

uint8_t count_set_bits(uint8_t reg) {
    uint8_t count=0;
    for(int i=0;i<8;i++){
        if(reg&0x01){count++;}
        reg=(reg<<1)|(reg>>7);
        reg&=0xFF;
    }
    return count;
}

int main() {
    uint8_t reg;
    scanf("%hhu", &reg);
    printf("%u", count_set_bits(reg));
    return 0;
}